CN104635119B - The insulated monitoring method and type insulation monitoring system of dynamical system - Google Patents
The insulated monitoring method and type insulation monitoring system of dynamical system Download PDFInfo
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Abstract
The present invention proposes a kind of insulated monitoring method and type insulation monitoring system of dynamical system, and the monitoring method comprises the following steps：Control first switch closure and control second switch disconnects, to obtain the current potential v5 of the point between electrical potential difference u7 and first switch and 3rd resistor between positive electrode bus and negative electrode bus over the ground；Second switch closure and control first switch closure are controlled, to obtain the current potential v5 ' of the point between the electrical potential difference u7 ' between positive electrode bus and negative electrode bus and first switch and 3rd resistor over the ground；And the insulaion resistance of insulaion resistance and negative pole over the ground of positive pole over the ground is obtained according to the current potential v5 ' of the point between the current potential v5 over the ground of the point between electrical potential difference u7, electrical potential difference u7 ', first switch and 3rd resistor and first switch and 3rd resistor over the ground.Method according to embodiments of the present invention, by detecting the electrical potential difference u7 and u7 ' between the current potential v5 and v5 ' and positive electrode bus and negative electrode bus of the point between first switch and 3rd resistor over the ground, to obtain insulaion resistance, therefore reduce cost.
Description
Technical field
The present invention relates to automobile technical field, the insulated monitoring method of more particularly to a kind of dynamical system and insulating monitoring system
System.
Background technology
The life of people has gradually been come into the fast development of electric automobile.Because electric automobile is with high-tension battery group
As power source, once Insulation Problems, which occur, will jeopardize the person and security appliance, therefore monitoring insulation fault promptly and accurately with
The security of the lives and property of user is most important.
Existing insulating monitoring mode is a variety of, such as signal injection method, amperometr iotac sensing and balanced bridge method etc. are specific such as
Under.
1st, signal injection method is that high frequency ac signal is injected into electrical system, and the other end connects ground or car body to gather
Signal, and calculate its insulaion resistance by calculating the change of its amplitude and phase.The accuracy in detection of this method easily receives
The influence of system distribution capacity, and can increase interference effect straight-flow system normal work when injecting AC signal.In addition should
Mode circuit is complicated, cost is high, stability is poor.
2nd, amperometr iotac sensing is to pass through current sensor by positive pole and negative pole to be measured in power-supply system are equidirectional together, when
When there is no leakage current, the electric current for returning to power cathode is equal to from the electric current of positive source outflow, therefore, through current sensor
Electric current is zero.Electric leakage situation can be monitored by the principle.This method can only monitor the insulation status under conducting state, and can not be
Both ends are leaked electricity simultaneously, or it is detected during electric leakage among system.
3rd, balanced bridge method is the principle using bridge circuit, it is believed that Devices to test straight-flow system positive and negative busbar has over the ground
One fixed insulaion resistance, the two insulaion resistances may be considered equal in the case that insulation is good, and positive and negative terminals can
As two bridge arms, ground can be used as a bridge arm, and can connect two big resistance of equivalence between positive and negative busbar in addition, two electricity
It is a bridge arm between resistance, thus constitutes a null-type bridge circuit, the electric current on string between ground and two resistance connected
Table.The electric bridge disequilibrium when insulating decline, ammeter just have electric current to flow through.This method is to building the accuracy requirement of circuit very
It is difficult to accomplish in high actual life, and when positive and negative insulating properties reduce simultaneously, it is impossible to accurately and timely alarm.
The content of the invention
The purpose of the present invention is intended at least solve one of above-mentioned technological deficiency.
Therefore, one aspect of the present invention provides a kind of insulated monitoring method of dynamical system.Methods described can solve cost
The problem of high, degree of accuracy and bad adaptability.
Another aspect of the present invention provides a kind of type insulation monitoring system.
In view of this, the embodiment of one aspect of the present invention proposes a kind of insulated monitoring method of dynamical system, the power
System includes：Electrokinetic cell, the positive electrode bus being connected with the power battery anode and it is connected with the power battery cathode
The insulaion resistance of the negative pole of negative electrode bus, the positive pole insulaion resistance over the ground of the dynamical system and the dynamical system over the ground by
Type insulation monitoring system is monitored, and the type insulation monitoring system includes：First switch, second switch and first resistor are to the 5th
Resistance, wherein, one end of the first switch is connected with the positive electrode bus, and the other end of the first switch passes through series connection the
Ground connection, one end ground connection of the second switch and the other end pass through the 3rd resistor and described the after one resistance and second resistance
The other end of one switch is connected, and the other end of the first switch is grounded after being connected by the 4th resistance, the 5th electricity
One end of resistance is connected with the negative electrode bus and the 5th resistance other end is grounded, and the described method comprises the following steps：Control
The first switch closes and controls the second switch to disconnect, to obtain the potential between the positive electrode bus and negative electrode bus
The current potential v5 of point over the ground between poor u7 and the first switch and the 3rd resistor；The second switch is controlled to close and control
The first switch closure is made, to obtain the electrical potential difference u7 ' between the positive electrode bus and negative electrode bus and the first switch
The current potential v5 ' of point over the ground between the 3rd resistor；And according to the electrical potential difference u7, the electrical potential difference u7 ', described
The point between point current potential v5 over the ground and the first switch and the 3rd resistor between one switch and the 3rd resistor
Current potential v5 ' over the ground obtains the insulaion resistance of insulaion resistance and the negative pole over the ground of the positive pole over the ground.
Method according to embodiments of the present invention, by detecting the electricity of point over the ground between first switch and the 3rd resistor
The current potential v5 ' and electrical potential difference u7 and u7 ' of point over the ground between position v5, first switch and the 3rd resistor, to obtain positive pole
The insulaion resistance of insulaion resistance and the negative pole over the ground over the ground, therefore cost is reduced, improve the accuracy of monitoring and fit
Ying Xing, while simplify monitoring process.
In one embodiment of the invention, the insulaion resistance of the positive pole and negative pole over the ground is calculated according to below equation：Wherein, RPFor the insulaion resistance of positive pole over the ground, RN
For the insulaion resistance of negative pole over the ground, A and B represent coefficient respectively, A=v5/ (u7-v5), B=v5 '/(u7 '-v5 '), R1, R2, R3,
R4 and R5 represents sampling resistor.
In one embodiment of the invention, in addition to：By positive pole insulaion resistance over the ground and the negative pole over the ground
Insulaion resistance respectively compared with the nominal resistance of corresponding insulaion resistance to obtain the first difference and the second difference；According to institute
The first difference or second difference are stated to obtain the insulaion resistance of insulaion resistance and the negative pole over the ground of the positive pole over the ground
The class of insulation；And when the class of insulation is less than predetermined level, alert simultaneously cuts off electrokinetic cell.
In one embodiment of the invention, in addition to：The normal row when the class of insulation is more than the predetermined level
Sail, and prompt message is sent to driver according to the size of the class of insulation.
In view of this, the embodiment of another aspect of the present invention proposes a kind of type insulation monitoring system, including：First switch,
To the 5th resistance and controller, the type insulation monitoring system is used for the positive pole pair for monitoring dynamical system for two switches and first resistor
The insulaion resistance of the insulaion resistance on ground and the negative pole of the dynamical system over the ground, wherein,
One end of the first switch is connected with the positive electrode bus, and the other end of the first switch passes through series connection first
Ground connection, one end ground connection of the second switch and the other end pass through the 3rd resistor and described first after resistance and second resistance
The other end of switch is connected, and the other end of the first switch is grounded after being connected by the 4th resistance, the 5th resistance
One end be connected with the negative electrode bus and the 5th resistance other end be grounded；And
Controller, the controller controls the first switch closure and controls the second switch to disconnect, to obtain
State point between the electrical potential difference u7 between positive electrode bus and negative electrode bus and the first switch and the 3rd resistor over the ground
Current potential v5, then control the second switch to close and control the first switch to close, to obtain the positive electrode bus and negative pole
The current potential v5 ' of the point between electrical potential difference u7 ' and the first switch and the 3rd resistor over the ground between bus, with according to institute
State point between electrical potential difference u7, the electrical potential difference u7 ', the first switch and 3rd resistor current potential v5 over the ground and described
The current potential v5 ' of point over the ground between first switch and the 3rd resistor obtains positive pole insulaion resistance over the ground and described negative
The insulaion resistance of pole over the ground.
Type insulation monitoring system according to embodiments of the present invention, by detecting the point between first switch and 3rd resistor over the ground
Current potential v5 and v5 ' and positive electrode bus and negative electrode bus between electrical potential difference u7 and u7 ', to obtain insulaion resistance, therefore drop
Low cost, improves the accuracy and adaptability of monitoring, while simplify monitoring process.
In one embodiment of the invention, the controller calculates the positive pole and negative pole over the ground according to below equation
Insulaion resistance：Wherein, RPFor positive pole over the ground exhausted
Edge resistance, RNFor the insulaion resistance of negative pole over the ground, A and B represent coefficient respectively, A=v5/ (u7-v5), B=v5 '/(u7 '-v5 '),
R1, R2, R3, R4 and R5 represent sampling resistor.
In one embodiment of the invention, the controller is additionally operable to according to positive pole insulaion resistance over the ground and should
The demarcation resistance of the insulaion resistance of the demarcation resistance and the negative pole of insulaion resistance over the ground and the insulaion resistance obtains insulation etc.
Level.
In one embodiment of the invention, in addition to：Alarm module, in positive pole insulaion resistance over the ground or
When the class of insulation of the insulaion resistance of the negative pole over the ground is less than predetermined level, alert.
In one embodiment of the invention, the controller is additionally operable to the insulaion resistance or described in the positive pole over the ground
When the class of insulation of the insulaion resistance of negative pole over the ground is less than predetermined level, electrokinetic cell is disconnected.
In one embodiment of the invention, the first switch and the second switch are optical coupled switch or metal-oxide-semiconductor.
The additional aspect of the present invention and advantage will be set forth in part in the description, and will partly become from the following description
Obtain substantially, or recognized by the practice of the present invention.
Brief description of the drawings
Of the invention above-mentioned and/or additional aspect and advantage will become from the following description of the accompanying drawings of embodiments
Substantially and it is readily appreciated that, wherein：
Fig. 1 is the structured flowchart according to the type insulation monitoring system of one embodiment of the invention；
Fig. 2 is the principle schematic according to the type insulation monitoring system of one embodiment of the invention；
Fig. 3 is the sampling time sequence figure according to one embodiment of the invention；
Fig. 4 is the control logic schematic diagram controlled according to the controller of the present invention；
Fig. 5 is the flow chart according to the insulated monitoring method of the dynamical system of one embodiment of the invention；And
Fig. 6 is the flow chart according to the insulated monitoring method of another embodiment of the present invention.
Embodiment
Embodiments of the invention are described below in detail, the example of embodiment is shown in the drawings, wherein identical from beginning to end
Or similar label represents same or similar element or the element with same or like function.Retouched below with reference to accompanying drawing
The embodiment stated is exemplary, is only used for explaining the present invention, and is not considered as limiting the invention.
In the description of the invention, it is to be understood that term " " center ", " longitudinal direction ", " transverse direction ", " on ", " under ",
The orientation or position relationship of the instruction such as "front", "rear", "left", "right", " vertical ", " level ", " top ", " bottom ", " interior ", " outer " are
Based on orientation shown in the drawings or position relationship, it is for only for ease of the description present invention and simplifies description, rather than instruction or dark
Show that the device of meaning or element there must be specific orientation, with specific azimuth configuration and operation, thus it is it is not intended that right
The limitation of the present invention.In addition, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint are relative
Importance.
In the description of the invention, it is necessary to illustrate, unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or be integrally connected；Can
To be mechanical connection or electrical connection；Can be joined directly together, can also be indirectly connected by intermediary, Ke Yishi
The connection of two element internals.For the ordinary skill in the art, with concrete condition above-mentioned term can be understood at this
Concrete meaning in invention.
Fig. 1 is the structured flowchart according to the type insulation monitoring system of one embodiment of the invention.As shown in figure 1, according to this hair
The type insulation monitoring system of bright embodiment includes：First switch OP1, second switch OP2 and first resistor R1 are to the 5th resistance R5
With controller MC, the type insulation monitoring system is for monitoring the insulaion resistance R of the positive pole of dynamical system over the groundNWith bearing for dynamical system
The insulaion resistance R of pole over the groundP。
Specifically, first switch OP1 one end is connected with positive electrode bus U+, and the first switch OP1 other end passes through series connection
Ground connection, second switch OP2 one end ground connection and the other end pass through 3rd resistor R3 and the after first resistor R1 and second resistance R2
The one switch OP1 other end is connected, and the first switch OP1 other end is grounded after being connected by the 4th resistance R4, the 5th resistance R5
One end be connected with negative electrode bus and the 5th resistance R5 other ends be grounded.Controller MC control first switch OP1 closures and control
Second switch OP2 disconnects, with obtain electrical potential difference u7 between positive electrode bus and negative electrode bus and first switch and 3rd resistor it
Between point current potential v5 over the ground, then control second switch OP2 to close and control first switch OP1 closures, to obtain positive electrode bus
The current potential v5 ' of the point between electrical potential difference u7 ' and first switch and 3rd resistor over the ground between negative electrode bus, with according to potential
Between point between poor u7, electrical potential difference u7 ', first switch and 3rd resistor current potential v5 over the ground and first switch and 3rd resistor
Point current potential v5 ' over the ground obtain the insulaion resistance of insulaion resistance and negative pole over the ground of positive pole over the ground.
Type insulation monitoring system according to embodiments of the present invention, by detecting the point between first switch and 3rd resistor over the ground
Current potential v5 and v5 ' and positive electrode bus and negative electrode bus between electrical potential difference u7 and u7 ', to obtain insulaion resistance, therefore drop
Low cost, improves the accuracy and adaptability of monitoring, while simplify monitoring process.
Above-mentioned type insulation monitoring system is described in detail below in conjunction with Fig. 2-Fig. 4.
Fig. 2 is the principle schematic according to the type insulation monitoring system of one embodiment of the invention.As shown in Fig. 2 left side
It is divided into dynamical system, for providing high voltage power supply, RPRepresent the insulaion resistance of positive pole over the ground, RNRepresent the insulated electro of negative pole over the ground
Resistance.Right part is type insulation monitoring system.First resistor R1 to the 5th resistance R5 is the sampling resistor of insulating monitoring in Fig. 2, the
Two switch OP2 can to 3rd resistor R3 connections or be grounded, first switch OP1 type insulation monitoring system can be connected with dynamical system or
Disconnect.First switch OP1 and second switch OP2 is optical coupled switch or metal-oxide-semiconductor in the present embodiment, and controller MC passes through control
Resistance R6 and R7 and resistance R8 and R9 are controlled to first switch OP1 and second switch OP2 respectively.Controller MC is to P2 points
Current potential be controlled, when P2 points are low potential first switch OP1 connect, when P2 points are high potential, first switch OP1 breaks
Open.Controller MC is controlled to the current potential of P1 points, and when P1 points are low potential, second switch OP2 is connected, when P1 points are high electricity
Second switch OP2 disconnects during position.
In one embodiment of the invention, controller MC is controlled to the current potential of P1 points and P2 points.When P2 points are low
Current potential, when P1 points are high potential, first switch OP1 is connected, and second switch OP2 disconnects.Now P3 points current potential be first switch and
Electricity of the electrical potential difference between positive electrode bus and negative electrode bus between current potential v5, the P3 point and P4 points of point over the ground between 3rd resistor
The resistance to earth value of potential difference u7, P3 point is r+, and the resistance to earth values of P4 points is r-, therefore v5/u7=r+/(r++r-), i.e. v5/
(u7-v5)=r+/r-, wherein r+=RP//R9//(R1+R2), r-=RN//R5.When P2 is low potential, and P1 is low potential, first
Switch OP1 to connect, second switch OP2 is connected, point current potential over the ground of the P3 point current potentials between first switch and 3rd resistor
Electrical potential difference u7 ' of the electrical potential difference between positive electrode bus and negative electrode bus between v5 ', P3 point and P4 points.P3 point resistance to earth value is r
+ ', P4 point resistance to earth value is r- ', then v5 '/u7 '=r+ '/(r+ '+r- '), i.e. v5 '/(u7 '-v5 ')=r+ '/r- ', wherein r
+’=RP//R4//(R1+R2) //R3, r-=RN//R5 and then the insulaion resistance R of positive pole over the ground can be obtainedPWith negative pole over the ground exhausted
Edge resistance RN.Represented especially by equation below：
Wherein, RPFor the insulaion resistance of positive pole over the ground, RNFor the insulaion resistance of negative pole over the ground, A and B represent that coefficient can respectively
It is expressed as, A=v5/ (u7-v5), B=v5 '/(u7 '-v5 '), R1, R2, R3, R4 and R5 represent sampling resistor.
Fig. 3 is the sampling time sequence figure according to one embodiment of the invention.As shown in figure 3, " 1 " represents that second switch OP2 connects
Logical, " 0 " represents that second switch OP2 disconnects.In v5, u7 sampling point timings figure and v5 ', u7 ' sampling point timings figure, " 1 " represents to adopt
Sample, " 0 " represents to stop sampling, and sampling instant of v5, u7 sampled point after second switch OP2 disconnections, v5 ', u7 ' sampled point are the
Two switch the sampling instant after OP2 are connected, and are solved by the calculation formula of above-mentioned insulaion resistance, now v5>V5 ', and
u7>U7 ' the formula are also denoted as,If it is unsatisfactory for inequality v5>
V5 ', and u7>U7 ', then export the insulating resistance value of failure acquiescence.
According to the type insulation monitoring system of the present invention, formed only by several resistance and switch and controller, and with detection
Electrical potential difference and current potential, to obtain insulaion resistance, therefore cost is reduced, improve the accuracy of monitoring, while which is simple
Easily realize, simplify monitoring link.
In one embodiment of the invention, controller MC can be single-chip microcomputer.Controller MC is carried out to system first
Initialization.After initialization terminates, connecting first switch OP1 makes type insulation monitoring system and dynamical system be connected, and makes controller MC
Carry out self-test.If self-test is by the way that controller MC disconnects first switch OP1, and fault message is stored；Work as self-test
By when, controller MC passes through with travel frequency（Such as 0.5Hz）The level of P1 points and P2 points is converted to first switch OP1 and the
Two switch OP2 are controlled.And by gathering the point between electrical potential difference u7, electrical potential difference u7 ', first switch and 3rd resistor over the ground
Current potential v5 and first switch and 3rd resistor between point current potential v5 ' over the ground, and the calculating for passing through above-mentioned insulaion resistance is public
Formula obtains the insulaion resistance R of positive pole over the groundPWith the insulaion resistance R of negative pole over the groundN.Again with the demarcation resistance value of corresponding insulaion resistance
It is compared to obtain the insulaion resistance R of positive pole over the groundPWith the insulaion resistance R of negative pole over the groundNThe class of insulation.When the insulation etc.
When level is less than predetermined level, disconnected by alarm module alert, and by type insulation monitoring system and dynamical system, to keep away
Exempt from the generation of accident.
Controller MV is according to the demarcation resistance and negative pole of positive pole insulaion resistance over the ground and the insulaion resistance over the ground exhausted
The demarcation resistance of edge resistance and the insulaion resistance obtains the class of insulation.In current positive pole insulaion resistance over the ground or negative pole over the ground
When the class of insulation of insulaion resistance is less than predetermined level, warning message is issued the user with by alarm module, while cut off and move
The connection of power battery pack.If the current class of insulation is more than predetermined level, different carry is issued the user with according to insulation status
Show information.For example, the class of insulation one is divided into 7 grades, and the 4th grade is predetermined level.When the current class of insulation is more than 4 grade
（Such as the 5th grade or the 6th grade）, alert is simultaneously cut off and the connection of power battery pack.If when the 2nd grade or 3rd level, vapour
Car normally travel, the current insulation status of user is prompted simply by different prompt messages, to prevent the generation of accident in advance.
Fig. 4 is the control logic schematic diagram controlled according to the controller of the present invention.As shown in figure 4, controller MC is right first
Fault is diagnosed, and point self-test up and down is carried out when no failure.Controller MC can be by controlling first switch OP1 and
Two switch OP2 disconnection or connection, gather the electrical potential difference of above-mentioned corresponding points（Typically can be between 0~4095）, and be converted
For 0~5V magnitude of voltage so as to obtain electrical potential difference u7, positive electrode bus and negative electrode bus between positive electrode bus and negative electrode bus it
Between electrical potential difference u7 ', first switch OP1 and 3rd resistor R3 between point current potential v5 and first switch OP1 and the 3rd over the ground
The current potential v5 ' of point over the ground between resistance R3.Calculated again to obtain positive pole insulaion resistance over the ground and negative pole over the ground exhausted
Edge resistance value.
Type insulation monitoring system according to embodiments of the present invention, by detecting the point between first switch and 3rd resistor over the ground
Current potential v5 and v5 ' and positive electrode bus and negative electrode bus between electrical potential difference u7 and u7 ', to obtain the insulated electro of positive pole over the ground
Resistance and the insulaion resistance of negative pole over the ground, therefore cost is reduced, the accuracy and adaptability of monitoring are improved, while simplify prison
Survey process.
Fig. 5 is the flow chart according to the insulated monitoring method of the dynamical system of one embodiment of the invention.As shown in figure 5,
The insulated monitoring method of dynamical system according to embodiments of the present invention comprises the following steps：Control first switch closure and control the
Two switch off, to obtain the point between electrical potential difference u7 and first switch and 3rd resistor between positive electrode bus and negative electrode bus
Current potential v5 over the ground（Step 101）.Second switch closure and control first switch closure are controlled, to obtain positive electrode bus and negative pole
The current potential v5 ' of the point between electrical potential difference u7 ' and first switch and 3rd resistor over the ground between bus（Step 103）.According to electricity
Point between potential difference u7, electrical potential difference u7 ', first switch and 3rd resistor current potential v5 over the ground and first switch and 3rd resistor it
Between point current potential v5 ' over the ground obtain the insulaion resistance of insulaion resistance and negative pole over the ground of positive pole over the ground（Step 105）.
Insulated monitoring method according to embodiments of the present invention, by detecting the point between first switch and 3rd resistor over the ground
Current potential v5 and v5 ' and positive electrode bus and negative electrode bus between electrical potential difference u7 and u7 ', to obtain insulaion resistance, therefore drop
Low cost, improves the accuracy and adaptability of monitoring, while simplify monitoring process.
Above steps is described in detail below in conjunction with accompanying drawing.
As shown in Fig. 2 dynamical system includes：Electrokinetic cell, the positive electrode bus being connected with power battery anode and and power
The insulation of the negative pole of the connected negative electrode bus of GND, the positive pole insulaion resistance over the ground of dynamical system and dynamical system over the ground
Resistance is monitored by type insulation monitoring system, and type insulation monitoring system includes：First switch OP1, second switch OP2 and the first electricity
R1 is hindered to the 5th resistance R5, wherein, first switch OP1 one end is connected with positive electrode bus, and the first switch OP1 other end passes through
Ground connection, second switch OP2 one end ground connection and the other end pass through 3rd resistor R3 after series connection first resistor R1 and second resistance R2
It is connected with the first switch OP1 other end, the first switch OP1 other end is grounded after being connected by the 4th resistance R4, the 5th electricity
Resistance R5 one end is connected with negative electrode bus and the 5th resistance R5 other ends are grounded.Wherein first switch OP1 and second switch OP2 can
Think optical coupled switch or metal-oxide-semiconductor.
In one embodiment of the invention, by being controlled to the current potential of P1 points and P2 points, so as to first
Switch OP1 and second switch OP2 is controlled.By controlling first switch OP1 and second switch OP2, at the first moment and 5
Two moment obtained between point between first switch and 3rd resistor current potential v5 over the ground, positive electrode bus and negative electrode bus respectively
The point between electrical potential difference u7 ' and first switch and 3rd resistor between electrical potential difference u7, positive electrode bus and negative electrode bus is over the ground
Current potential v5 ', and the insulaion resistance R of positive pole over the ground is obtained by equation belowPWith the insulaion resistance R of negative pole over the groundN.The formula can
To be expressed as：
Wherein, RPFor the insulaion resistance of positive pole over the ground, RNFor the insulaion resistance of negative pole over the ground, A and B represent coefficient respectively, A=
The current potential of point over the ground of v5/ (u7-v5), B=v5 '/(u7 '-v5 '), v5 ' between first switch OP1 and 3rd resistor R3, R1,
R2, R3, R4 and R5 represent sampling resistor.
In the example of the present invention, if v5>V5 ', and u7>Just can be public by the calculating of above-mentioned insulaion resistance during u7 '
Formula obtains insulaion resistance RPAnd RN.If it is unsatisfactory for inequality v5>V5 ', and u7>U7 ', then export failure acquiescence resistance value.
Method according to embodiments of the present invention, by detecting the current potential of point over the ground between first switch and 3rd resistor
The current potential v5 ' and electrical potential difference u7 and u7 ' of point over the ground between v5, first switch and 3rd resistor, to obtain positive pole over the ground
The insulaion resistance of insulaion resistance and negative pole over the ground, therefore cost is reduced, improve the accuracy and adaptability of monitoring, while letter
Monitoring process is changed.
In one embodiment of the invention, by the positive pole insulaion resistance of insulaion resistance and negative pole over the ground over the ground respectively with
The nominal resistance of corresponding insulaion resistance is compared to obtain the first difference and the second difference.Then according to the first difference or second
Difference is to obtain the class of insulation of the insulaion resistance of insulaion resistance and negative pole over the ground of positive pole over the ground.It is less than in the class of insulation default
During grade, alert simultaneously cuts off electrokinetic cell.If the current class of insulation is more than predetermined level, according to insulation status
Issue the user with different prompt messages.For example, the class of insulation one is divided into 7 grades, and the 4th grade is predetermined level.Current exhausted
When edge grade is more than 4 grade（Such as the 5th grade or the 6th grade）, alert is simultaneously cut off and the connection of power battery pack.If
When being the 2nd grade or 3rd level, automobile normal running, the current insulation status of user is prompted simply by different prompt messages, with
The generation of accident is prevented in advance.
As shown in Figure 2 and Figure 6, dynamical system is initialized first, then connecting first switch OP1 makes insulating monitoring
System is connected to dynamical system, to carry out self-test to dynamical system.When self-test by when, be opened or closed second with certain frequency
Switch OP2 makes connection or off resistance R3 to obtain the point between electrical potential difference u7, electrical potential difference u7 ', first switch and 3rd resistor
The current potential v5 ' of point over the ground between current potential v5 over the ground and first switch and 3rd resistor, and the calculating for passing through insulaion resistance is public
Formula can respectively obtain the insulaion resistance R of positive pole over the groundPWith the insulaion resistance R of negative pole over the groundN.According to RPAnd RNWith corresponding insulated electro
The demarcation resistance difference of resistance carries out grade classification to current state of insulation to be carried out to the insulation status of current dynamical system
Diagnosis.If less than predetermined level, then warning message is issued the user with, and disconnect first switch OP1 and second switch OP2, and
Store fault message.If being not less than the predetermined level, that is, automobile normal operation when meeting service condition, and continue monitoring insulation
The insulation status of resistance, while prompt message is issued the user with according to the different insulative grade of combined running condition.When default etc.
When level is the 4th grade, the 1st grade to the 4th grade is the condition for meeting operation.
Method according to embodiments of the present invention, by detecting the current potential of point over the ground between first switch and 3rd resistor
The current potential v5 ' and electrical potential difference u7 and u7 ' of point over the ground between v5, first switch and 3rd resistor, to obtain positive pole over the ground
The insulaion resistance of insulaion resistance and negative pole over the ground, therefore cost is reduced, improve the accuracy and adaptability of monitoring, while letter
Monitoring process is changed.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art is not departing from the principle and objective of the present invention
In the case of above-described embodiment can be changed within the scope of the invention, change, replace and modification.
Claims (10)
1. a kind of insulated monitoring method of dynamical system, it is characterised in that the dynamical system includes：Electrokinetic cell, with it is described
The connected positive electrode bus of power battery anode and the negative electrode bus being connected with the power battery cathode, the dynamical system are just
The insulaion resistance of pole insulaion resistance over the ground and the negative pole of the dynamical system over the ground is monitored by type insulation monitoring system, described
Type insulation monitoring system includes：First switch, second switch and first resistor to the 5th resistance, wherein,
One end of the first switch is connected with the positive electrode bus, and the other end of the first switch passes through first resistor of connecting
Pass through the 3rd resistor and the first switch with ground connection, one end ground connection of the second switch and the other end after second resistance
The other end be connected, the other end of the first switch is grounded after being connected by the 4th resistance, the one of the 5th resistance
End is connected with the negative electrode bus and the 5th resistance other end is grounded, and the described method comprises the following steps：
Control the first switch to close and control the second switch to disconnect, with obtain the positive electrode bus and negative electrode bus it
Between electrical potential difference u7 and the first switch and the 3rd resistor between point current potential v5 over the ground；
Control the second switch to close and control the first switch to close, with obtain the positive electrode bus and negative electrode bus it
Between electrical potential difference u7' and the first switch and the 3rd resistor between point current potential v5' over the ground；And
According to the electricity of the point between the electrical potential difference u7, the electrical potential difference u7', the first switch and the 3rd resistor over the ground
The current potential v5' of point over the ground between position v5 and the first switch and the 3rd resistor obtains the insulated electro of the positive pole over the ground
Resistance and the insulaion resistance of the negative pole over the ground.
2. the insulated monitoring method of dynamical system as claimed in claim 1, it is characterised in that according to calculating below equation
The insulaion resistance of positive pole and negative pole over the ground：
<mrow>
<msub>
<mi>R</mi>
<mi>P</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mfrac>
<mi>B</mi>
<mrow>
<mo>(</mo>
<mi>A</mi>
<mo>-</mo>
<mi>B</mi>
<mo>)</mo>
<mi>R</mi>
<mn>3</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mi>R</mi>
<mn>4</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mi>R</mi>
<mn>1</mn>
<mo>+</mo>
<mi>R</mi>
<mn>2</mn>
</mrow>
</mfrac>
</mrow>
</mfrac>
<mo>,</mo>
<msub>
<mi>R</mi>
<mi>N</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mfrac>
<mrow>
<mi>A</mi>
<mi>B</mi>
</mrow>
<mrow>
<mo>(</mo>
<mi>A</mi>
<mo>-</mo>
<mi>B</mi>
<mo>)</mo>
<mi>R</mi>
<mn>3</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mi>R</mi>
<mn>5</mn>
</mrow>
</mfrac>
</mrow>
</mfrac>
</mrow>
Wherein, RPFor the insulaion resistance of the positive pole over the ground, RNFor the insulaion resistance of the negative pole over the ground, A and B represent respectively be
Number, A=v5/ (u7-v5), B=v5'/(u7'-v5'), R1, R2, R3, R4 and R5 represent sampling resistor.
3. the insulated monitoring method of dynamical system as claimed in claim 1, it is characterised in that also include：
The insulaion resistance of insulaion resistance and the negative pole over the ground of the positive pole over the ground is nominal with corresponding insulaion resistance respectively
Resistance is compared to obtain the first difference and the second difference；
According to first difference or second difference to obtain positive pole insulaion resistance over the ground and the negative pole over the ground
Insulaion resistance the class of insulation；And
When the class of insulation is less than predetermined level, alert simultaneously cuts off electrokinetic cell.
4. the insulated monitoring method of dynamical system as claimed in claim 3, it is characterised in that also include：
The normally travel when the class of insulation is more than the predetermined level, and according to the size of the class of insulation to driver
Send prompt message.
A kind of 5. type insulation monitoring system, it is characterised in that including：First switch, second switch and first resistor to the 5th electricity
Resistance and controller, the type insulation monitoring system are used to monitoring the positive pole of dynamical system insulaion resistance over the ground and the dynamical system
Negative pole insulaion resistance over the ground, wherein,
One end of the first switch is connected with the positive electrode bus, and the other end of the first switch passes through first resistor of connecting
Pass through the 3rd resistor and the first switch with ground connection, one end ground connection of the second switch and the other end after second resistance
The other end be connected, the other end of the first switch is grounded after being connected by the 4th resistance, the one of the 5th resistance
End is connected with the negative electrode bus and the 5th resistance other end is grounded；And
Controller, the controller control the first switch closure and control the second switch to disconnect, with obtain it is described just
The current potential of the point between electrical potential difference u7 and the first switch and the 3rd resistor over the ground between pole bus and negative electrode bus
V5, then control the second switch to close and control the first switch to close, to obtain the positive electrode bus and negative electrode bus
Between electrical potential difference u7' and the first switch and the 3rd resistor between point current potential v5' over the ground, with according to the electricity
The current potential v5 and described first of point over the ground between potential difference u7, the electrical potential difference u7', the first switch and the 3rd resistor
Switch and obtain positive pole insulaion resistance over the ground and the negative pole pair the point current potential v5' over the ground between the 3rd resistor
The insulaion resistance on ground.
6. type insulation monitoring system as claimed in claim 5, it is characterised in that the controller is according to calculating below equation
The insulaion resistance of positive pole and negative pole over the ground：
<mrow>
<msub>
<mi>R</mi>
<mi>P</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mfrac>
<mi>B</mi>
<mrow>
<mo>(</mo>
<mi>A</mi>
<mo>-</mo>
<mi>B</mi>
<mo>)</mo>
<mi>R</mi>
<mn>3</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mi>R</mi>
<mn>4</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mi>R</mi>
<mn>1</mn>
<mo>+</mo>
<mi>R</mi>
<mn>2</mn>
</mrow>
</mfrac>
</mrow>
</mfrac>
<mo>,</mo>
<msub>
<mi>R</mi>
<mi>N</mi>
</msub>
<mo>=</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mfrac>
<mrow>
<mi>A</mi>
<mi>B</mi>
</mrow>
<mrow>
<mo>(</mo>
<mi>A</mi>
<mo>-</mo>
<mi>B</mi>
<mo>)</mo>
<mi>R</mi>
<mn>3</mn>
</mrow>
</mfrac>
<mo>-</mo>
<mfrac>
<mn>1</mn>
<mrow>
<mi>R</mi>
<mn>5</mn>
</mrow>
</mfrac>
</mrow>
</mfrac>
</mrow>
Wherein, RPFor the insulaion resistance of the positive pole over the ground, RNFor the insulaion resistance of the negative pole over the ground, A and B represent respectively be
Number, A=v5/ (u7-v5), B=v5'/(u7'-v5').
7. type insulation monitoring system as claimed in claim 5, it is characterised in that the controller is additionally operable to according to the positive pole pair
The mark of the insulaion resistance on ground and the insulaion resistance of the demarcation resistance and the negative pole of the insulaion resistance over the ground and the insulaion resistance
Determine resistance and obtain the class of insulation.
8. type insulation monitoring system as claimed in claim 5, it is characterised in that also include：
Alarm module, the class of insulation for the insulaion resistance of insulaion resistance or the negative pole over the ground in the positive pole over the ground are small
When predetermined level, alert.
9. type insulation monitoring system as claimed in claim 5, it is characterised in that the controller is additionally operable in the positive pole over the ground
The class of insulation of insulaion resistance or the negative pole insulaion resistance over the ground when being less than predetermined level, disconnect electrokinetic cell.
10. type insulation monitoring system as claimed in claim 5, it is characterised in that the first switch and the second switch are
Optical coupled switch or metal-oxide-semiconductor.
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| CN106291282A (en) * | 2016-08-11 | 2017-01-04 | 北京新能源汽车股份有限公司 | Insulation monitoring device and method for power system |
| CN109991475B (en) * | 2019-03-26 | 2021-01-08 | 安徽贵博新能科技有限公司 | KF observer-based bridge type insulation detection circuit and method |
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| CN102298092B (en) * | 2011-05-29 | 2014-07-23 | 启明信息技术股份有限公司 | Method and device for detecting power battery insulation resistance of electric automobile |
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